Solid stabilized hydrogen peroxide compositions



United States Patent 3,376,110 SOLID STABILIZED HYDROGEN PEROXIDE COMPOSITIONS Dimitry Alexis Shiraeif, Kutztown, Pa., assignor to General Aniline & Film Corporation, New York, N.Y., a corporation of Delaware N0 Drawing. Filed Jan. 30, 1967, Ser. No. 612,349 9 Claims. (Cl. 23-207.5)

ABSTRACT OF THE DISCLOSURE A solid stabilized hydrogen peroxide composition comprising hydrogen peroxide and a stabilizing amount of a water-insoluble polymeric N-vinyl heterocyclic compound which may be prepared by drying an aqueous slurry of said components.

This invention is directed to solid stabilized hydrogen peroxide compositions containing a stabilizing amount of a water-insoluble polymeric N-vinyl heterocyclic compound, as well as to the method of producing stabilized compositions.

It is Well known that hydrogen peroxide, even when present in an aqueous composition, is adversely effected by the presence of oxidizable impurities and catalytic agents and is, therefore, susceptible to deterioration or related degradation upon standing and storage. This is a serious disadvantage to industry, since such concentrates often must be stored for extended periods of time up to Weeks or months. A number of stabilizers and deterioration inhibitors have been proposed for the purpose of preventing such deterioration. However, these known stabilizers or inhibitors vary in their effectiveness and by and large exhibit one or more disadvantages such as being expensive, failing to prevent effervescence, imparting undesirable color, or lacking sufiicient solubility. Stabilized aqueous hydrogen peroxide solutions also have the disadvantage of losing their stability upon storage and decompose at high temperatures. Moreover, the risk of explosion and the hazards of spillage that are attendant to the transportation further add to the disadvantage of such stabilized aqueous solutions.

It is an object of this invention to provide a stabilized hydrogen peroxide composition which is not subject to the above mentioned disadvantages. Another object of this invention is to provide a stabilized solid hydrogen peroxide composition containing a stabilizing amount of a water-insoluble polymeric N-vinyl heterocyclic compound, thereby extending the useful life span of hydrogen peroxide by providing stabilized solid compositions that may be safely shipped and stored at room or higher temperatures, and used as required. A further object of this invention is to provide methods for the manufacture of said stabilized compositions. Other objects and advantages of this invention will become apparent as this description proceeds.

The attainment of the above objects is made possible by the instant invention which is directed to novel and unobvious stabilized solid compositions comprising hydrogen peroxide and a stabilizing amount of a polymeric N-vinyl heterocyclic compound. I have made the surprising discovery that the instant stabilized solid compositions may be formed by drying, e.g., evaporating an aqueous slurry of H 0 containing a stabilizing amount of a water-insoluble polymeric N-vinyl heterocyclic compound to apparent dryness until a solid granular freefiowing powder has been obtained. It is believed that complexes of polymeric N-vinyl heterocyclic compounds and hydrogen peroxide are formed upon drying the aqueous compositions of same, but I prefer not to be ice limited to any particular theory as to the manner or mode in which this invention may operate. While these complexes are solid granular dry products, they are not necessarily anhydrous due to the hydrophilic nature of the polymeric N-vinyl heterocyclic compounds and amounts of moisture which do not affect the solid dry characteristics of the complexes can be tolerated.

Water-insoluble polymeric N-vinyl heterocyclic compounds which I have found useful in the practice of the present invention are illustrated by the following compounds: (a) crosslinked water-insoluble poly-N-vinyl polylactams of the type produced by polymerizing a vinyl lactam, i.e., an organic ring compound containing in its ring an acyl group attached to a nitrogen atom, in the presence of an alkaline catalyst as described, for example, in U.S. Patents 2,938,017 and 3,277,066 and U.S. application, Ser. No. 318,195, filed Oct. 25, 1963 by Grosser, Hort and Schwartz, now U.S. Patent 3,306,886, such as the polymers of N-vinyl polypyrrolidone, preferably poly- N-vinyl poly-Z-pyrrolidone, poly-N-vinylpoly-2-piperidone poly-N-vinylpoly-2-piperidone and poly-N-vinyl-poly-Z- caprolactam; (b) water-insoluble poly-N-vinyl polyimides produced as described in U.S. patent application Ser. No. 285,870, filed June 6, 1963, now U.S. Patent 3,306,881; and (c) Water-insoluble copolymers of the before mentioned N-vinyl heterocyclic compounds containing a high percentage of water-insoluble vinyl monomer produced from polymerizing N-vinyl heterocyclic and dissimilar vinyl monomers such as described in U.S. Patent 2,667,473 and U.S. Patent 2,947,633, for example.

Homopolymers, random type copolymers and graft copolymers of the above described types having molecular Weights from about 1,000 to 500,000 are preferred in the practice of this invention. Generally, I prefer to use polyvinylpolypyrrolidone having molecular weights of from about 300,000 to 400,000. For some applications it may be advantageous to use mixtures of the above described polymeric materials having different molecular weight ranges.

When copolymers are used, the weight ratio of the component N-vinyl heterocyclic monomer to that of the dissimilar vinyl monomer in the copolymer will determine its properties. Choice of the weight ratio will depend on the particular properties desired in the copolymer. Preferred weight ratios of N-vinyl heterocyclic monomer to dissimilar vinyl monomers include ratios from 40:60 upward.

The amount of hydrogen peroxide present in the aqueous hydrogen peroxide slurries that are to be dried in order to obtain the instant solid compositions, has not been found to be critical, since weak slurries of hydrogen peroxide, as well as strong slurries of hydrogen peroxide have been effectively utilized. A proportion of hydrogen peroxide is retained in the instant stabilized compositions, i.e., free flowing powder obtained upon drying the aqueous hydrogen peroxide slurries containing a water-insoluble polymeric N-vinyl heterocyclic compound. This proportion of retained hydrogen peroxide appears to vary with the concentration of hydrogen peroxide in relation to the heterocyclic compound and with the total volume of the slurry. It is preferred that sufficient hydrogen peroxide be present before drying, so as to obtain a solid composition containing at least about 2% and preferably about 4.5 to 70% by weight H 0 based on the weight of the polymer compound present in the final product.

The amount of water-insoluble polymeric N-vinyl heterocyclic preservatives added to the aqueous hydrogen peroxide solutions is also not critical, the only requirement being that sufficient amounts be added so that the hydrogen peroxide in the solid composition is stabilized. It is obvious that the amount added will vary with the heterocyclic compound, the amount of hydrogen peroxide in the aqueous solution, as well as the particular use desired of the stabilized composition. However, it is preferred to use at least 1 part by weight of heterocyclic compound per 10 parts by weight of hydrogen peroxide.

invention and are not to be regarded as limitative. It is to be understood that all parts, percentages and proportions referred to herein and in the appended claims are by weight unless otherwise indicated.

Example I The instant sol1d compositions are not only stable under room temperature storage, but even when heated Seven dlffereht Sohd granhlal stahlhleq hydrogen at 100 C. for 6' hours in an electric oven, have been Pef0Xide-Wate1"ihS01ub1e P Y y P YPY r found to still retain a substantial amount of hydrogen Positions Y P p y eaffylng out the tOhOWlhg peroxide. The retention of hydrogen peroxide in the solid 10 four experhhehtsi granular compositions would seem to indicate there is In EXPefhheht 1 P 1 and f a hydro a formation of some loose compound between the heterogen PefOXlde Solution hydrogen pe were c li compound d hydrogen peroxide, d di added to two different amounts of a water-insoluble polyhaps on the interplay of the residual valence forces. Howy p yhy e r P p aeeofdlhg to Example I In ever, this is merely an explanation by way of theory and it pp filed 1963, is understood that applicant does not intend to be limited contained in an evaporatlhg dlsh- The dlsh was Placed by the manner or mode in which this invention may op- 011 a Welter bath and the eOhtehtS evaporated to an P- erate. parent dryness of the residue. The contents of the dish The manner in whi h th aqueous hydrogen id were transferred to a beaker, filtered through a Gooch compositions ar formed i t i i l, Since h crucible and washed. The crucibles with the residues were ponents may be added in any manner. For instance, the then dried t Constant Welght 111 an Oven at 50 solid polymeric N-vinyl heterocyclic compound may be In Expeflmeht 2 p 3 and the Same Procedure mixed with 100% H 0 or added to an aqueous solution as in Experiment 1 Was p y P that 50 of of the hydrogen peroxide or alternatively 100% hydrogen an aqueous hydrogen p ht SOhItlOIl y e peroxide may be added to an aqueous slurry of the Peroxide) and larger qll'ehtltles 0f p y y p yp heterocyclic compound or an aqueous slurry of the done Were used heterocyclic compound and an aqueous solution of hydro- In EXDertmeht 3 p a 100 I111- q h y gen peroxide may be mixed together. As stated above, g n p i l i n hy r gen per xide) w the preparation of the instant stable, solid hydrogen added to the P y y p py eonttllhed In a peroxide polymeric N-viny1 heterocyclic o o itio 3O beaker. The mixture was stirred by a magnetic stirrer for may be carried out by drying th aqueous counterpart 2 hours. The contents of the beaker were then filtered compositions. While the presence of water is technically through a Buchner funnel and suction Was m in not essential in the formation of the instant solid com- Overnight y the residuepositions, due to the danger and hazards of fire and ex- In Experiment 4 (Sample 6) a 50 ml. aqueous hydrogen plosion accompanied with the handling of pure hydro- PefOXide S01uti0n(50% y g P )W afided to gen peroxide, the use of intermediate aqueous solutions the P y y p ypy 111 an evaporatlhg dlsh and or slurries is definitely preferred. The method of drying is Contents evaporated on a at r bath until a freeflowimmaterial, and essentially any means of vaporizing or ihg POWder was obtained Sample 7 Was P p 111 the evaporating the water may be employed, the only re- Same manner except that a 100 1111- eq hydrogen quirement being that care must be taken to see that the Peroxide Solution hydrogen P r e desired dry compositions are not destroyed. Thus, heating The amount of hydrogen P eehtalhed 111 the in trays in a drying oven, evaporation on a steam bath, above prepared solid granular compositions was evaluated and drum drying either at atmospheric pressure or under y titratihg to determine the hydrogen Peroxide Contentvacuum have been found to be effective. Suction filtration The quantities used and the results of analysis of the may be used if desired. 45 product are summarized in the following table:

TABLE I Sample No g 3 4 5 6 7 Weight 01' polyvinylpolypyrrolidone used (grams) 2486 .2606 5. 021 5. 017 10. 0 10. 0 10. 0 H203 in product (pcrcent/wgt.) based on product wei ht 33. 02 52.82 64. 22 68. 27 26.76 51.20 61.72

The instant stabilized, solid compositions have a wide Example II range of utility in both the commercial and industrial fi 1d F example, they may f the basis of washing In order to demonstrate the stability of the instant solid concentrates, bleaching agents, disinfecting agents, steriligranular Stablhzed hydrogen er Water-Insoluble zation agents, etching agents and cosmetic agents. Morepolyvmylpolypyrrolrdone P to Storage at room over, they may be utilized in various bleaching operations, rf a Pomon of Sample 6 of Example such as the bleaching of wool and human hair or they pomon of Sample 7 of Example I were t placfid 1n may be used as clarification and sterilization agents for Sample W Covered with punctured alumlhulh f011 e beverages such as beer, whisky, wine and other alcoholic l stanemg m the laboratory at room temperature h and fermented beverages. In addition, such compositions 1131' H or these samples Were also p t In like may b d to Provide a source of oxygen which can be containers and stored in a refrigerator. The following table released at a controlled rate for sterilization and may be (lemonstrates the rPXFenent Stablhty of the Instant applied directly to wounds or from the basis of a permat slrmrnarlzmg the resrllts or hydregeh PeI'OXIde nently antiseptic material. Moreover, the instant stabilized remammg the samples at Intervals durlng a 37 day compositions may be used as catalysts, in situ, polymeri- Storage Periodzations requiring a free radical source. Itis, therefore, TABLE HrPERCENTIWGT' H202 BASED ON PRODUCT apparent that the present stabilized compositions may be WEIGHT formulated'with the usual additives, for example pH modifiers, detergents, sunscreen agents, emollients, brighteners, and the like, depending on the particular use contemplated.

The following examples are illustrative of the present 5 6 Example III TABLE v In order to demonstrate the stability of the instant percent stabilized solid granular compositions at high temperagg ifigg g a' g igag fig g f g g gfi tures, 7 portions of Sample 7 of Example I were placed i p oly pyllzfligorg g in small weighing dishes without a cover and weighed. idone/H1OI The mouth of each dish (except No. 1 used as a control) 1% 5 195 25 277 was wrapped with aluminum foil and aluminum foil puncg %8 E8 gg tured in the center. The other six dishes were placed in 10 40 160 25 18:30 an oven at'100' C. After 1 hour dish No. 2 was removed, $8 g8 g8 g3 the aluminum foil taken off, and the dish plunged into 10 25 100 100 25 29:90 a 2 liter volumetric flask. The foil was rinsed into the :28 23 g g same flask and the volume of the flask brought to the mark 40 160 40 25 40: 30 with water. An aliquot was taken out and titrated for 50 0 hydrogen peroxide with 0.1 N thiosulphate to determine the amount of hydrogen peroxide retained by the solid 15 composition. The same procedure was performed with dish Various modifications and variations of this invention No. 3 after it had remained in the oven for 2 hours and will be obvious to a worker skilled in the art and it is the same procedure on the other dishes followed in 3 then understood that such modifications and variations are to 4 then 5 and finally after a six hour stay in the oven. The be included within the purview of this application and results of the analysis are given in the following table: the spirit and scope of the appended claims.

TABLE III Dish No. 1 2 3 4 5 6 7 Kept in oven at 100 0.

(hrs. None 1 2 3 4 5 6 H202 found based on product weight, percent- 62.20 53. 47 48.09 37.18 22.90 15.44 14.19 H1O; percent of ollglnal 100 85.96 77.32 59. 77 36.82 24. 82 22.81 1110; percent loss 14. O4 22. 68 40. 23 63.23 75. 18 77. 19

Example IV I claim:

A slurry of 200 g. of polyvinylpolypyrrolidone prepared Sohd stablhzq .composltlon compnsmg bydrogen as g g of gases:assistants:instantiated: peroxi e 0 2 2 an 1 m 0 water were p'ace' amount of h dro en eroxide resent is at least about 2% m a largepetn dlsll on a water Path' The mp 16 was by Wei ht b sed in the Weigh? of polymer in the product. heated with occasional stirring until evaporation of the 2 Stabilized composition as defined in claim 1 water and excess hydrogen peroxide was complete. Upon g g f assassinate:assassinate? 2 was recovere an ound to contain o y rogen peroxide. After over 5 months of storage, the powder was 6 gf g g g i fizb Y fiz 'g g fi g; Stlll found to contam approxlmately 140% hydrogen per- 40 N-vin l h etei' oc clic monomers with dissi fla 1 monoxide,l (;lemonstlr1atingbtlhe effectiveness of polyvinylpolyomersy y m y pyrro 1 one as t e sta 1 izing agent.

Other water-insoluble polymeric N-vinyl heterocyclic 1 11 ?g 11 g iiii ggigs i ag sj 3 5x18; 33 53 compounds may be used in the above examples instead of watepinsoluie y 01 Vin 1 01 y rrolidoye p polyvinylpolypyrrolidone. Such compounds include water- 4 A Solid g g i 55 n as gai in laim insoluble polymers -such as poly'Nvinyl polyimidazole 1 wherein the ol meric N- in l heteroc clic com ound PO1y N Vinyl p Olyp 1P eridone poly'N vinylpolycaprolac' is water-insolub ie y 01 -N-vin 1 ol -2- Zrolidone p tam, water-insoluble copolymers of N-vinyl-Z-pyrrolidone 5 A Ocess arin g f sglbilized Si and vinyl acetate, water-insoluble copolymers of N-vinyltion' as gefined in 1 gwhich com rises d l Z-pyrrolidone and styrene, water-insoluble copolymers of aqueous composition of hymgen per 0x516 and i N'vinyl'z'pyrrolidone and vinyl .chlofide water'insoluble insoluble polymeric N vinyl heterocyclic compound copolymers f N'vlnyla'pyrrohldone methyl vinyl 6. A process as defined in claim 5, wherein the waterether or h g? It Is to und.ers.tdod that mlmomers of insoluble polymeric N-vinyl heterocyclic compound is other lactamsfiN'vmyl lmldes or the may be selected from the group consisting of water-insoluble polyused 1n the preparation of the above water-Insoluble N vinyl p 01y] actams watepinsoluble poly N vinyl poly copolymers" imides, and water-insoluble copolymers of N-vinyl hetero- Example V cyclic monomers with dissimilar vinyl monomers.

Another series of solid stabilized hydrogen peroxide- 7. A process as defined in claim 5, wherein the polypolyvinylpolypyrrolidone compositions were prepared by meric N-vinyl heterocyclic compound is water-insoluble the following procedure: Polyviflylpolypyfrolidone- A slurry of polyvinylpolypyrrolidone in hydrogen perox- 8. A process as defined in claim 5, wherein the polyide solution was prepared by adding 25 g. of polyvinylmeric N-vinyl heterocyclic compound is water-insoluble polypyrrolidone prepared as in Example I, to 200 ml. of poly-N-vinyl-poly-Z-pyrrolidone. hydrogen peroxide solution. The concentration of the hy- 9. A solid stabilized composition as defined in claim drogen peroxide solution was varied over a range of from 1, wherein the amount of hydrogen peroxide present is 1%% H 0 to 50% H 0 The slurry preparation was from about 4.5% to about by weight. stirred with a magnetic stirrer for one hour at room temperature and then filtered through an 8 cm. Buchner funnel References Clted lined with two sheets of 41H filter paper. The filtering 70 UNITED STATES PATENTS process was very rapid and was discontinued when no more liquid could be extracted. The polyvinylpolypyrrolidone/H O sample was removed from the Buchner funnel and placed in a pan on the steam bath for 30 minutes to dry. The results are shown in the following table:

OSCAR R. VERTIZ, Primary Examiner. H. S. MILLER, Assistant Examiner. 

